Guideline decision tool · Nephrology
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Fractional Excretion of Sodium (FENa) — free guideline decision tool
Calculate the fractional excretion of sodium (FENa) to work up acute kidney injury.
Open guideline tool →Computed locally — no data uploaded. For licensed clinicians.
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Guideline-based
Implements the decision logic from published clinical guidelines.
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Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
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Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Common questions
What does Fractional Excretion of Sodium (FENa) do?
Differentiate pre-renal from intrinsic (ATN) acute kidney injury.
How is the result calculated?
FENa = (UNa × PCr) / (PNa × UCr) × 100. < 1% pre-renal; > 2% intrinsic/ATN.
Is this a substitute for clinical judgement?
No. All results are decision-support only, for licensed clinicians. They must be individualized to the whole patient and the latest guideline version.
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Run Fractional Excretion of Sodium (FENa) now
Calculate the fractional excretion of sodium (FENa) to work up acute kidney injury.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
Related guideline tools
For use by licensed clinicians and clinical researchers. Computed locally in your browser — no data is uploaded. Not a substitute for clinical judgement.